About us

Accountancy firm in Oslo

Langseth Services AS is an authorised accountancy firm based in Ryen and Kolbotn, Oslo. Our team of experienced accountants offers financial services to small and medium-sized businesses. Our services are tailored to meet your needs for accounting and financial services. Our strong professional expertise and modern system solutions make us a reliable business partner. We can provide consultancy services that are tailored to meet your company’s specific needs.

Langseth Services AS is a member of the Norwegian Institute of Public Accountants

The Norwegian Institute of Public Accountants is a professional body of registered public accountants and state authorised public accountants that provides its members with extensive information services and advisory activities and that is engaged in the professional development of auditing and accounting practices in Norway and internationally.

Our Services

Langseth Services AS provides a broad range of services in the areas of accounting, payroll, invoicing, consultancy, etc. Our staff can personally visit your offices to perform accounting or other financial tasks.


  • Voucher processing system for submitting scanned vouchers
  • Voucher entry and registration
  • Remittance advice notes for incoming invoices
  • Bank transactions
  • Invoicing
  • Monitoring of accounts receivable, issuing reminders and forwarding claims for debt collection processing
  • Monitoring suppliers
  • Reporting to public authorities, including VAT returns
  • Reconciliation and documentation of balance sheet items and profit/loss
  • Preparation of documentation for audits

HR and payroll

  • Running payrolls
  • E-mailing of payslips
  • Certificates of pay and tax deducted
  • Employer’s payment records for National Insurance contributions and payroll withholding tax
  • Processing deductions for child support and attachments of earnings
  • Calculation and disbursement of holiday pay
  • Submission of employee and payroll information (coordinated scheme involving the NAV State Register of Employers and Employees, Statistics Norway, and the Norwegian Tax Administration)

Annual accounts, taxes

  • Annual accounts with notes
  • Assistance with preparing annual reports
  • Assistance with completing records of board meetings and annual general meetings
  • Preparing tax returns and enclosures
  • VAT registration
  • Indirect tax advisory service
  • Tax advisory
  • Communication with the Norwegian Tax Administration and chief municipal treasurers

Ancillary services

  • Business formation
  • Changes in share capital
  • Changes in company information
  • Mergers and demergers
  • Acquisitions and disposals
  • Business successions
  • Financial analyses
  • Rationalising business procedure

Contact us today!

We are a reliable accountancy firm offering consultancy services that are tailored to meet your company’s specific needs.
  • Mail: niclas@langsethservices.no
  • Adress, Ryen: Ryensvingen 3, 0615 Oslo
  • Adress, Kolbotn: Ormerudveien 82, 1410 Kolbotn
  • Opening hours: From 8 am to 4 pm